It depends on the ski width, terrain and whether you're a hard charger or a mellow skier. Aside from the usual hard charging AT boots like the Scarpa Maestrale and Dynafit Radicals, maybe look towards the 1100-1200 gram category like the La Sportiva Solar, Scarpa F1, Roxa RX Tour, Fischer Travsers, Dynafit TLT Speed. Ideally those boots pair up well with 85-100ish mm underfoot skis but still soft enough for splitboarding. I think that's the sweet spot for a one boot quiver.
I ski in the Roxa R3 130 flex resort/backcountry boot and kinda wanting to use it on an alpine board. My old Burton Wind were super painful and heavy. I had no issues alpine carving in a pair of stiff Dalbello. Does anybody else here ride in ski boots on an alpine set up?